Drawing instrument.



J. ERIGKSON.

DRAWING INSTRUMENT.

APPLICATION rum) 11:3.4, 1910.

Patented July 25, 1911.

Elma/MM CDLUMBIA PLANOGIAPMYCOH WASHINGIDN, D- C4 FFICE.

JOHN EBICKSON, OF WARREN, PENNSYLVANIA.

DRAWING INSTRUMENT.

. Specification of Letters Patent.

Application filed February 4, 1910.

Patented July 25, 1911.

Serial No. 542,055.

To all whom it may concern:

Be it known that I, JOHN ERIOKSON, a citizen of the United States,residing at WVarren, in the count-y of Warrenand State of Pennsylvania,have invented new and useful Improvements in Drawing Instruments, ofwhich the following is a specification.

This invention relates to a combined compass, scriber, divider andcaliper, the object of this invention being to provide a device of thischaracter primarily intended for use in connection with carpentry,masonry, etc., which is extremely simple in construction and which willperform the functions for which it is intended with accuracy and surety.

With the above objects in view, the invention resides in the novelconstruction and arrangement of parts hereinafter fully described andclaimed.

In the drawings accompanying this specification and forming a partthereof, Figure l is a front elevation of an instrument constructed inaccordance with this invention and showing the same when used forscribing a frame to be fitted to a rough surface. Fig. 2 is a frontelevation of one of the arms of the instrument to which a pencil isattached. Fig. 3 is a vertical transverse sectional view upon the line33 of Fig. 4 the clasp member being shown in elevation. Fig. 4 is anedge view of the device illustrated in Fig. 2. Fig. 5 is a top plan viewof the yieldable pencil holding clasp. Fig. 6 is a view illustrating thedevice employed for scribing a circle upon a rough surface, such as astone or the like.

In the drawings the numeral 1 designates the improved instrument. Thisinstrument comprises essentially a pair of arms 2 and 3, which arepivotally connected as at 4. The pivot 4 is provided with a threadedportion, and the same is adapted for the reception of a suitable nut 4whereby the said arms 2 and 3 may be forced into frictional engagementwith each other. The ends of the arms 2 and 3 are each provided with aprojecting threaded element 5. These elements 5 are preferably arrangedupon the arms in opposite directions and each of the said elements isprovided with a winged nut 6.

The numeral 8 designates the leg of the instrument. This leg 8 ispreferably provided with an elongated slot or opening adapted to form apassage so that the said member 8 may be inserted upon the threadedelement 5 between one of the faces of one of the arms and gne of thewinged nuts 6. By this arrangement it will be noted that the said leg 8may be easily and quickly attached to one of the arms and sustained infrictional engagement therewith through the medium of the binding wingednut 6.

WVhile in Figs. 1 and 6 the device has been illustrated as provided witha single leg 8, it is to be understood that both of the arms 2 and 8 maybe, if desired supplied with a leg.

The pencil clasp best illustrated in Fig. 5 of the drawings, isconstructed of a single piece of resilient metal. The said claspdesignated by the numeral 14 comprises a split collar 15 having its freeends integrally formed with outwardly extending arms 16. The arms 16 areeach of a semi-cylindrical cross sectional format-ion and each of thesaid arms is formed with a transversely arranged depression 17, thedepression on one of the arms being adapted to aline with the depressionupon the opposite arm, and the purpose of these depressions will bepresently apparent.

The numeral 10 designates the clasp retaining clamp. This clamp 10 isalso constructed of a single blank of resilient material, the samecomprising a substantially U- shaped member. The upper portion of theclamp is cut away approximately from the central portion of the bodythereof to provide the oppositely spaced arms 11. This cut away portionis adapted to form means whereby the clamp may be inserted over the bolt5 and the projecting threaded portion of the said bolt has its wingednut 6 tightly engaging the outer face of the said clamp 10 whereby theclamp is tightly compressed against one of the arms 2 or 3. The collar15 is adapted to engage a pencil or marking element 18 and the bolt 5 isadapted to snugly engage within the depressions 17 of the arms 16. Itwill be noted that when the nut 6 is turned toward the arm 3 upon thebolt 5 the resilient clamp 10 will compress the arms 16 and the saidarms lying between the bolt and the lower offset portion 12 of the clamp10 will effectively sustain the clasp upon the arm 3.

I claim In a device of the class described, a pair of arms pivotallyconnected together adjacent one of their ends, the opposite ends of thearms being provided with projecting threaded elements, wing nuts forthese elements, a leg member having its upper portion slotted adapted toengage between one of the arms and the corresponding winged nut, aresilient clamp upon the opposite projecting element of the oppositearm, said clamp being of a substantially U-shaped formation, a markingmember receiving clasp, said clasp being constructed of a single pieceof resilient material provided with an eye and a pair of projectingarms, each of said arms being provided with depressions, substantiallyas and for the purpose set forth.

In testimony whereof I afiix my signature in presence of two witnesses.

JOHN ERIGKSON.

\Vitnesses FLORENCE SANDBLADE, W. KING.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents. Washington, D. G.

